2785400730728 has 96 divisors (see below), whose sum is σ = 6630167131200. Its totient is φ = 1084800729600.

The previous prime is 2785400730713. The next prime is 2785400730733. The reversal of 2785400730728 is 8270370045872.

It is a self number, because there is not a number n which added to its sum of digits gives 2785400730728.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11126213 + ... + 11373803.

It is an arithmetic number, because the mean of its divisors is an integer number (69064240950).

Almost surely, 2^{2785400730728} is an apocalyptic number.

2785400730728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2785400730728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3315083565600).

2785400730728 is an abundant number, since it is smaller than the sum of its proper divisors (3844766400472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2785400730728 is a wasteful number, since it uses less digits than its factorization.

2785400730728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250231 (or 250220 counting only the distinct ones).

The product of its (nonzero) digits is 5268480, while the sum is 53.

The spelling of 2785400730728 in words is "two trillion, seven hundred eighty-five billion, four hundred million, seven hundred thirty thousand, seven hundred twenty-eight".